/**
 * 
 */

	//var firstName = "Fack";
	//var lastName;
	//var age = 25;
	//age = 24.5;
	//age = "abc";
	//married = true;
	//car = null;
	//alert(car);
	//alert(min(3,5));
	//alert(min());
	
	//function min(a, b){
	//	if (a<b)
	//		return a;
	//	else 
	//		return b;
	//}
	
	//function test(){
	//	alert("ABC");
	//}
	
	//var t = test();
	//t();
	
	//function Student(math, english, chinese){
	//	this.Math = math;
	//	this.english = english;
	//	this.chinese = chinese;
	//	this.average = function(){
	//		return (math+english+chinese)/3;
	//	}
	//}
	
	//var stu = newStudent(100,95,93);
	//alert(stu.average());
	
	var s = "Jacjson";
	alert(s.length);
	alert(s.substring(0, 3));
	
	
	